STAT-UB.0103 Quiz A 2012.FEB.23
Version BLUE Solutions
1. In each of the following situations, please supply the best answer. Each sub-part is
worth 5 points.
1.1.
The list of values x1, x2, , xn has standard deviation s = 15. If each
value in the list is

NOTES for Monday 2012.JAN.30
STAT-UB.0103
By the way, if the list x1, x2, , xn constitutes an entire population (rather than a
1
2
sample) we define the standard deviation as =
xi , where we use
n
1N
=
xi as a replacement for x . For now, do not be over

NOTES for Thursday 2012.JAN.26
STAT-UB.0103
Weve been dabbling in various numeric summaries for quantitative data. Crudely we
separate these (so far) in terms of measures of location (position) and measures of spread
(variability).
The common statistical

STAT-UB.0103
NOTES for Wednesday 2012.JAN.25
Lets consider a number of devices for displaying quantitative, or measured, data.
These devices can also be used for ordered qualitative data.
We can always make histograms for quantitative data. Lets illustrat

C22.0103
NOTES for 2012.JAN.23
Office hours for Gary Simon, Spring 2012
These are tentative, pending committee times.
Mondays:
3:30 p.m. 5:00 p.m.
Thursdays
noon 1:30 p.m.
The course syllabus has been distributed in class. Please note the important dates.

STAT-UB.0103
NOTES for Thursday 2012.FEB.16
An interesting backward application is Petersons estimate. In this case N
represents the unknown number of animals on some closed ecosystem (such as a lake
or island). The object is to estimate N, and we do it b

STAT-UB.0103
NOTES for Wednesday 2012.FEB.15
Suppose that a hospital has a cardiac care unit which handles heart attack victims
on the first day of their problems. The geographic area served by the hospital
creates new patients as observations on a Poisso

STAT-UB.0103
NOTES for Monday 2012.FEB.13
If X is a binomial random variable with parameters n and p (meaning that X is the
number of successes in n independent trials where each trial has success
probability p), then the mean of the distribution of X is

STAT-UB.0103
NOTES for Thursday 2012.FEB.09
The random variables that we deal with are put into two general classes:
Discrete random variables are those which are counted. These would
include number of defectives in a manufacturing process, number of stoc

STAT-UB.0103
NOTES for Wednesday 2012.FEB.08
Here is an interesting misuse of independence. The website
http:/howmanyofme.com claims to give the number of people in the United
States with any name. They do this for first names, last names, and then for fu

Notes for Monday 2012.FEB.06
STAT-UB.0103
Reprise on the taxi problem. Let
G
B
G
B
be the event that a green taxi caused the accident
be the event that a blue taxi caused the accident
be the event that Ralph said green
be the event that Ralph said blue
We

STAT-UB.0103
Notes for Thursday 2012.FEB.02
Here is the formula for conditional probability. If A and B are two events with P(B) > 0,
P AB
then we define P(A | B ) = probability of A, given that B has already occurred, as
.
PB
bg
af
We read this as probab

STAT-UB.0103
Notes for Wednesday, 2012.FEB.01.
For many problems, we need to do a little counting. We try to construct a sample
space S for which the elements are equally likely. Then for any event E, we will
have P ( E ) =
elements in E
. It can tricky c

STAT-UB.0103
Quiz A
2012.FEB.23
Version RED
Solutions
1. The probability of winning at a certain game is only 0.10. Claudia is going to play
this game as long as it takes to get at least one winner. What is the probability that
Claudia will need 10 or mor

INFORMATION ABOUT EXAM A OF 2012.FEB23
nnnnnnnnnnnnnnnnnnnnnnnnnnnn
The exam of 2012.FE B.23 will be of the open-book variety. You may also be asked to
examine output from the program Minitab. You may find it helpful to have a functioning
calculator. Here

Chapter 2.1
1. The difference between a class boundary and a class limit is that class limit consists of the
possible data values and class boundary is not the possible data values, rather the upper class
boundaries are 0.5 unit higher than the upper clas